一道tricky的语法题

felix

A SC problem that puzzled me, maybe u?
A tough SC question, need XDJM help and discussion over it.

New Oritenal book No.2
24.(Even though its per capita food supply hardly increased during two decades), stringent rationing and planned distribution have allowed the People’s republic of China to ensure nutritional levels of 2,000 calories per person per day for its population.

(A): Even though its per capita food supply hardly increased during two decades,
(B): Even though its per capita food supply has hardly increased in two decades

which one is better???
C,D,E is apparently wrong, so drop them.


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linsonstudy

主句使用现在完成时时态，表示一段时间的事情，even though 引导的让步状语从句就要用现在完成时态与之相匹配。

felix

thanks! linson.
I got it.